RV Tire Safety: Pressure, Age, and Blowout Prevention

We were cruising down I-70 in Utah at 65 mph when the motorhome two lanes over had a rear tire blowout. The sound was like a cannon going off. Rubber flew everywhere, the rig swerved hard, and the driver barely kept it out of the median. We pulled over to help, and the shaken couple told us the tires "looked fine" that morning. They were nine years old.

Tire failures are the number one mechanical cause of RV breakdowns in the US, and nearly all of them are preventable.

Understanding RV Tire Pressure

The single most important thing you can do for your tires is check pressure before every drive. Not every week. Not every trip. Every single time you start the engine and plan to move.

Under-inflated tires flex more than they are designed to, which generates heat. Heat is the enemy of rubber. Excessive heat breaks down the tire's internal structure and leads to blowouts, often without any visible warning beforehand. Over-inflated tires are also dangerous because they reduce your contact patch, give you less traction, and wear unevenly.

Finding your correct pressure

The correct tire pressure is NOT the number printed on the tire sidewall. That number is the maximum pressure the tire can handle. Your correct pressure depends on the actual weight on each axle. The best approach is to weigh your fully loaded RV at a truck stop scale (most CAT Scales cost about $15) and then consult the tire manufacturer's load and inflation chart to find the right pressure for your load.

If you cannot get to a scale, use the pressure listed on the placard inside your driver's side door frame or in your owner's manual. This is the manufacturer's recommended pressure for the RV at its rated weight.

TPMS: Your best investment

A Tire Pressure Monitoring System (TPMS) alerts you in real time while driving if any tire loses pressure or overheats. Sensors screw onto each valve stem and transmit to a dashboard monitor. Good systems cost $100 to $250 depending on how many tires you need to monitor. After the blowout we witnessed in Utah, we bought one immediately and consider it the single best safety investment we have made.

Tire Age: The Hidden Danger

Here is something most new RV owners do not realize: tires expire. Rubber degrades over time from UV exposure, ozone, and temperature changes, even if the tread looks perfect and the tires have low mileage. Most tire manufacturers and the RV Industry Association recommend replacing RV tires after 5 to 7 years regardless of tread depth or appearance.

How to read the DOT date code

Every tire has a DOT (Department of Transportation) code stamped on the sidewall. The last four digits tell you the week and year of manufacture. For example, a code ending in 2319 means the tire was made in the 23rd week of 2019. If those last four digits tell you the tire is older than 6 years, it is time to start shopping for replacements, no matter how good the tread looks.

Blowout Prevention: A Practical Checklist

Before every trip

Check pressure on all tires including the spare. Use a quality digital gauge, not the pencil-type ones from the gas station. Those are rarely accurate. Check when cold. Inflate to the correct pressure based on your load.

Do a visual inspection. Walk around the RV and look at every tire. Check for cracks in the sidewall, bulges, cuts, uneven wear, and objects stuck in the tread. Any sidewall cracking (called weather checking or dry rot) is a sign the rubber is degrading.

During your trip

Monitor your TPMS. If you get a low-pressure alert, pull over at the next safe location and investigate. Do not assume it is a sensor error. A slow leak that drops 10 PSI over two hours of driving can become a blowout in the third hour.

Slow down in the heat. High ambient temperatures plus highway speeds plus heavy loads equals maximum tire stress. When it is 100 degrees outside, the road surface can reach 150 degrees. Consider reducing speed by 5 to 10 mph on extremely hot days, especially if your tires are older.

Ongoing maintenance

Rotate your tires according to the manufacturer's recommendation, typically every 5,000 to 8,000 miles. This ensures even wear and helps you spot alignment issues early.

Cover your tires when your RV is in storage. UV rays are the primary cause of rubber degradation. Tire covers cost $20 to $40 for a set and dramatically extend tire life. If you cannot get covers, park in the shade or at least face the most exposed tires away from the afternoon sun.

Avoid tire dressings that contain petroleum solvents. Many spray-on tire shine products actually accelerate rubber breakdown. If you want your tires to look nice, use a water-based tire cleaner and protectant designed for RV use.

What to Do If You Have a Blowout

Do not slam the brakes. This is the hardest thing to do in the moment, but braking hard during a blowout can cause you to lose control. Instead, grip the steering wheel firmly with both hands, take your foot off the gas, and let the vehicle slow down gradually. Gently steer to the shoulder once you are at a safe speed. Turn on your hazard lights immediately.

Do not try to change an RV tire on the highway shoulder. RV tires are heavy, the jacks are dangerous to use on uneven ground, and passing traffic is a serious hazard. Call roadside assistance. Good Sam, AAA RV, and Coach-Net all offer RV-specific roadside service for $100 to $150 per year. This is another investment we consider mandatory.

Your Tires Are the Foundation

Everything about your RV trip depends on those four (or six, or eight) patches of rubber touching the road. Treat them with respect, check them often, replace them when they age out, and invest in a TPMS. It is not glamorous, but it is the difference between arriving safely and sitting on a highway shoulder waiting for a tow truck.

For more on keeping your rig road-ready, read our beginner's guide to RV camping and use our RV trip cost calculator to budget for tire replacement and maintenance costs.